Fundamental study for estimation of medium constants from temperature rise by ultrasound irradiation

DOI 29 References
  • YAMAYA Chiaki
    Department of Electrical and Electronic Engineering, Faculty of Engineering and Resource Science,Akita University
  • INOUE Hiroshi
    Department of Electrical and Electronic Engineering, Faculty of Engineering and Resource Science,Akita University

Bibliographic Information

Other Title
  • 超音波照射による媒質内温度上昇からの媒質定数の推定のための基礎検討

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Purpose: To develop a method for estimating the medium constant from the temperature rise produced by ultrasound irradiation. Subjects and Methods: Ultrasound was irradiated to a sample medium placed in the path of propagation through water. We used a thin thermocouple to measure the temperature in the medium. The temperature in the medium was calculated using a simulation method that combined ultrasonic propagation and heat conduction. Results and Discussion: (1)Temperature rise of the medium, (2) temperature rise of the thermocouple, and (3) artifacts generated when ultrasound reaches the temperature sensor are included in the temperature measurement. The measured temperature differs from the simulation in which only the temperature rise of the medium is calculated. These three factors of the measured temperature depend on the distance characteristic of ultrasound intensity and the characteristic is proportional to the exponential curve on which the constant is the absorption coefficient. The normalized temperature distribution of measurement agrees with that derived from the simulation. Conclusion: Since the influence of the thermal conductivity and specific heat are not reflected in the normalized temperature distribution, this study shows that the absorption coefficient is significantly affected by the inclination of the temperature distribution. This practical estimation method is thus expected to prove useful in estimating the absorption coefficient.

Journal

  • Choonpa Igaku

    Choonpa Igaku 35 (6), 671-680, 2008

    The Japan Society of Ultrasonics in Medicine

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